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Roberto Sassu 90e944aa9a evm: Check also if *tfm is an error pointer in init_desc() 
[ Upstream commit 53de3b080d5eae31d0de219617155dcc34e7d698 ]

This patch avoids a kernel panic due to accessing an error pointer set by
crypto_alloc_shash(). It occurs especially when there are many files that
require an unsupported algorithm, as it would increase the likelihood of
the following race condition:

Task A: *tfm = crypto_alloc_shash() <= error pointer
Task B: if (*tfm == NULL) <= *tfm is not NULL, use it
Task B: rc = crypto_shash_init(desc) <= panic
Task A: *tfm = NULL

This patch uses the IS_ERR_OR_NULL macro to determine whether or not a new
crypto context must be created.

Cc: stable@vger.kernel.org
Fixes: d46eb3699502b ("evm: crypto hash replaced by shash")
Co-developed-by: Krzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: Krzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-03-16 16:28:06 +08:00
Documentation USB: hub: Revert commit bd0e6c9614b9 ("usb: hub: try old enumeration scheme first for high speed devices") 2021-03-16 16:26:56 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch KVM: SVM: Fix potential memory leak in svm_cpu_init() 2021-03-16 16:28:06 +08:00
block iocost: protect iocg->abs_vdebt with iocg->waitq.lock 2021-03-16 16:27:41 +08:00
certs Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto gcc-10: avoid shadowing standard library 'free()' in crypto 2021-03-16 16:27:59 +08:00
drivers i2c: dev: Fix the race between the release of i2c_dev and cdev 2021-03-16 16:28:06 +08:00
fs fanotify: fix merging marks masks with FAN_ONDIR 2021-03-16 16:28:02 +08:00
include SUNRPC: Revert 241b1f419f0e ("SUNRPC: Remove xdr_buf_trim()") 2021-03-16 16:28:04 +08:00
init x86: Fix early boot crash on gcc-10, third try 2021-03-16 16:28:02 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel Stop the ad-hoc games with -Wno-maybe-initialized 2021-03-16 16:27:58 +08:00
lib lib: devres: add a helper function for ioremap_uc 2021-03-16 16:27:29 +08:00
mm shmem: fix possible deadlocks on shmlock_user_lock 2021-03-16 16:27:44 +08:00
net bpf: Fix sk_psock refcnt leak when receiving message 2021-03-16 16:28:05 +08:00
package config/arm64: OPEN CONFIG_PSI and phytium configs 2021-03-16 11:02:59 +08:00
samples vmalloc: fix remap_vmalloc_range() bounds checks 2021-03-16 16:26:56 +08:00
scripts scripts/decodecode: fix trapping instruction formatting 2021-03-16 16:27:43 +08:00
security evm: Check also if *tfm is an error pointer in init_desc() 2021-03-16 16:28:06 +08:00
sound Revert "ALSA: hda/realtek: Fix pop noise on ALC225" 2021-03-16 16:28:03 +08:00
tools bpf: Test_progs, fix test_get_stack_rawtp_err.c build 2021-03-16 16:28:05 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: arm: vgic: Synchronize the whole guest on GIC{D,R}_I{S,C}ACTIVER read 2021-03-16 16:27:45 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Makefile: disallow data races on gcc-10 as well 2021-03-16 16:28:05 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0